An emergency command system is provided. The emergency command system selectively operated in a real time monitoring mode, a forecast mode, and a strategy inferring mode includes an input interface unit, a scene information unit, an emergency status providing unit, a strategy inferring unit, an output interface unit, and a commanding unit. The emergency status providing unit receives an alarm signal corresponding to an emergency, and produces scene simulation data according to the alarm signal and a set of scene information in the scene information unit corresponding to the emergency. The strategy inferring unit produces a strategy inference diagram according to the scene simulation data and/or strategy data input through the input interface unit, thereby displaying through the output interface unit. The commanding unit transmits command signals produced according to the strategy data to terminal devices. The disclosure further provides an emergency command method.